The AD598 datasheet specify a drive distance over a cable of 300 feet.
There are no informations in the AD698 on how much cable length can be driven.
The AD698 is a complete, monolithic Linear Variable Differential Transformer (LVDT) signal conditioning subsystem. It is used in conjunction with LVDTs...
AD698 on Analog.com
The AD698 has the ability to drive a longer cable length compared to the AD598 since it has a higher output voltage and excitation current. Note that both LVDT Signal conditioner does not require a constant amplitude because it works on the ratio of the difference and sum of the LVDT output signals.